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   1 /*
   2  *  Panasonic HotKey and LCD brightness control driver
   3  *  (C) 2004 Hiroshi Miura <miura@da-cha.org>
   4  *  (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
   5  *  (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
   6  *  (C) 2004 David Bronaugh <dbronaugh>
   7  *  (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
   8  *
   9  *  derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License version 2 as
  13  *  publicshed by the Free Software Foundation.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
  23  *
  24  *---------------------------------------------------------------------------
  25  *
  26  * ChangeLog:
  27  *      Sep.23, 2008    Harald Welte <laforge@gnumonks.org>
  28  *              -v0.95  rename driver from drivers/acpi/pcc_acpi.c to
  29  *                      drivers/misc/panasonic-laptop.c
  30  *
  31  *      Jul.04, 2008    Harald Welte <laforge@gnumonks.org>
  32  *              -v0.94  replace /proc interface with device attributes
  33  *                      support {set,get}keycode on th input device
  34  *
  35  *      Jun.27, 2008    Harald Welte <laforge@gnumonks.org>
  36  *              -v0.92  merge with 2.6.26-rc6 input API changes
  37  *                      remove broken <= 2.6.15 kernel support
  38  *                      resolve all compiler warnings
  39  *                      various coding style fixes (checkpatch.pl)
  40  *                      add support for backlight api
  41  *                      major code restructuring
  42  *
  43  *      Dac.28, 2007    Harald Welte <laforge@gnumonks.org>
  44  *              -v0.91  merge with 2.6.24-rc6 ACPI changes
  45  *
  46  *      Nov.04, 2006    Hiroshi Miura <miura@da-cha.org>
  47  *              -v0.9   remove warning about section reference.
  48  *                      remove acpi_os_free
  49  *                      add /proc/acpi/pcc/brightness interface for HAL access
  50  *                      merge dbronaugh's enhancement
  51  *                      Aug.17, 2004 David Bronaugh (dbronaugh)
  52  *                              - Added screen brightness setting interface
  53  *                                Thanks to FreeBSD crew (acpi_panasonic.c)
  54  *                                for the ideas I needed to accomplish it
  55  *
  56  *      May.29, 2006    Hiroshi Miura <miura@da-cha.org>
  57  *              -v0.8.4 follow to change keyinput structure
  58  *                      thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
  59  *                      Jacob Bower <jacob.bower@ic.ac.uk> and
  60  *                      Hiroshi Yokota for providing solutions.
  61  *
  62  *      Oct.02, 2004    Hiroshi Miura <miura@da-cha.org>
  63  *              -v0.8.2 merge code of YOKOTA Hiroshi
  64  *                                      <yokota@netlab.is.tsukuba.ac.jp>.
  65  *                      Add sticky key mode interface.
  66  *                      Refactoring acpi_pcc_generate_keyinput().
  67  *
  68  *      Sep.15, 2004    Hiroshi Miura <miura@da-cha.org>
  69  *              -v0.8   Generate key input event on input subsystem.
  70  *                      This is based on yet another driver written by
  71  *                                                      Ryuta Nakanishi.
  72  *
  73  *      Sep.10, 2004    Hiroshi Miura <miura@da-cha.org>
  74  *              -v0.7   Change proc interface functions using seq_file
  75  *                      facility as same as other ACPI drivers.
  76  *
  77  *      Aug.28, 2004    Hiroshi Miura <miura@da-cha.org>
  78  *              -v0.6.4 Fix a silly error with status checking
  79  *
  80  *      Aug.25, 2004    Hiroshi Miura <miura@da-cha.org>
  81  *              -v0.6.3 replace read_acpi_int by standard function
  82  *                                                      acpi_evaluate_integer
  83  *                      some clean up and make smart copyright notice.
  84  *                      fix return value of pcc_acpi_get_key()
  85  *                      fix checking return value of acpi_bus_register_driver()
  86  *
  87  *      Aug.22, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
  88  *              -v0.6.2 Add check on ACPI data (num_sifr)
  89  *                      Coding style cleanups, better error messages/handling
  90  *                      Fixed an off-by-one error in memory allocation
  91  *
  92  *      Aug.21, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
  93  *              -v0.6.1 Fix a silly error with status checking
  94  *
  95  *      Aug.20, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
  96  *              - v0.6  Correct brightness controls to reflect reality
  97  *                      based on information gleaned by Hiroshi Miura
  98  *                      and discussions with Hiroshi Miura
  99  *
 100  *      Aug.10, 2004    Hiroshi Miura <miura@da-cha.org>
 101  *              - v0.5  support LCD brightness control
 102  *                      based on the disclosed information by MEI.
 103  *
 104  *      Jul.25, 2004    Hiroshi Miura <miura@da-cha.org>
 105  *              - v0.4  first post version
 106  *                      add function to retrive SIFR
 107  *
 108  *      Jul.24, 2004    Hiroshi Miura <miura@da-cha.org>
 109  *              - v0.3  get proper status of hotkey
 110  *
 111  *      Jul.22, 2004    Hiroshi Miura <miura@da-cha.org>
 112  *              - v0.2  add HotKey handler
 113  *
 114  *      Jul.17, 2004    Hiroshi Miura <miura@da-cha.org>
 115  *              - v0.1  start from toshiba_acpi driver written by John Belmonte
 116  *
 117  */
 118
 119 #include <linux/kernel.h>
 120 #include <linux/module.h>
 121 #include <linux/init.h>
 122 #include <linux/types.h>
 123 #include <linux/backlight.h>
 124 #include <linux/ctype.h>
 125 #include <linux/seq_file.h>
 126 #include <linux/uaccess.h>
 127 #include <linux/slab.h>
 128 #include <acpi/acpi_bus.h>
 129 #include <acpi/acpi_drivers.h>
 130 #include <linux/input.h>
 131
 132
 133 #ifndef ACPI_HOTKEY_COMPONENT
 134 #define ACPI_HOTKEY_COMPONENT   0x10000000
 135 #endif
 136
 137 #define _COMPONENT              ACPI_HOTKEY_COMPONENT
 138
 139 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
 140 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
 141 MODULE_LICENSE("GPL");
 142
 143 #define LOGPREFIX "pcc_acpi: "
 144
 145 /* Define ACPI PATHs */
 146 /* Lets note hotkeys */
 147 #define METHOD_HKEY_QUERY       "HINF"
 148 #define METHOD_HKEY_SQTY        "SQTY"
 149 #define METHOD_HKEY_SINF        "SINF"
 150 #define METHOD_HKEY_SSET        "SSET"
 151 #define HKEY_NOTIFY              0x80
 152
 153 #define ACPI_PCC_DRIVER_NAME    "Panasonic Laptop Support"
 154 #define ACPI_PCC_DEVICE_NAME    "Hotkey"
 155 #define ACPI_PCC_CLASS          "pcc"
 156
 157 #define ACPI_PCC_INPUT_PHYS     "panasonic/hkey0"
 158
 159 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
 160    ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
 161 */
 162 enum SINF_BITS { SINF_NUM_BATTERIES = 0,
 163                  SINF_LCD_TYPE,
 164                  SINF_AC_MAX_BRIGHT,
 165                  SINF_AC_MIN_BRIGHT,
 166                  SINF_AC_CUR_BRIGHT,
 167                  SINF_DC_MAX_BRIGHT,
 168                  SINF_DC_MIN_BRIGHT,
 169                  SINF_DC_CUR_BRIGHT,
 170                  SINF_MUTE,
 171                  SINF_RESERVED,
 172                  SINF_ENV_STATE,
 173                  SINF_STICKY_KEY = 0x80,
 174         };
 175 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
 176
 177 static int acpi_pcc_hotkey_add(struct acpi_device *device);
 178 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
 179 static int acpi_pcc_hotkey_resume(struct acpi_device *device);
 180 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
 181
 182 static const struct acpi_device_id pcc_device_ids[] = {
 183         { "MAT0012", 0},
 184         { "MAT0013", 0},
 185         { "MAT0018", 0},
 186         { "MAT0019", 0},
 187         { "", 0},
 188 };
 189 MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
 190
 191 static struct acpi_driver acpi_pcc_driver = {
 192         .name =         ACPI_PCC_DRIVER_NAME,
 193         .class =        ACPI_PCC_CLASS,
 194         .ids =          pcc_device_ids,
 195         .ops =          {
 196                                 .add =          acpi_pcc_hotkey_add,
 197                                 .remove =       acpi_pcc_hotkey_remove,
 198                                 .resume =       acpi_pcc_hotkey_resume,
 199                                 .notify =       acpi_pcc_hotkey_notify,
 200                         },
 201 };
 202
 203 #define KEYMAP_SIZE             11
 204 static const unsigned int initial_keymap[KEYMAP_SIZE] = {
 205         /*  0 */ KEY_RESERVED,
 206         /*  1 */ KEY_BRIGHTNESSDOWN,
 207         /*  2 */ KEY_BRIGHTNESSUP,
 208         /*  3 */ KEY_DISPLAYTOGGLE,
 209         /*  4 */ KEY_MUTE,
 210         /*  5 */ KEY_VOLUMEDOWN,
 211         /*  6 */ KEY_VOLUMEUP,
 212         /*  7 */ KEY_SLEEP,
 213         /*  8 */ KEY_PROG1, /* Change CPU boost */
 214         /*  9 */ KEY_BATTERY,
 215         /* 10 */ KEY_SUSPEND,
 216 };
 217
 218 struct pcc_acpi {
 219         acpi_handle             handle;
 220         unsigned long           num_sifr;
 221         int                     sticky_mode;
 222         u32                     *sinf;
 223         struct acpi_device      *device;
 224         struct input_dev        *input_dev;
 225         struct backlight_device *backlight;
 226         unsigned int            keymap[KEYMAP_SIZE];
 227 };
 228
 229 struct pcc_keyinput {
 230         struct acpi_hotkey      *hotkey;
 231 };
 232
 233 /* method access functions */
 234 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
 235 {
 236         union acpi_object in_objs[] = {
 237                 { .integer.type  = ACPI_TYPE_INTEGER,
 238                   .integer.value = func, },
 239                 { .integer.type  = ACPI_TYPE_INTEGER,
 240                   .integer.value = val, },
 241         };
 242         struct acpi_object_list params = {
 243                 .count   = ARRAY_SIZE(in_objs),
 244                 .pointer = in_objs,
 245         };
 246         acpi_status status = AE_OK;
 247
 248         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
 249                                       &params, NULL);
 250
 251         return status == AE_OK;
 252 }
 253
 254 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
 255 {
 256         unsigned long long s;
 257         acpi_status status;
 258
 259         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
 260                                        NULL, &s);
 261         if (ACPI_SUCCESS(status))
 262                 return s;
 263         else {
 264                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 265                                   "evaluation error HKEY.SQTY\n"));
 266                 return -EINVAL;
 267         }
 268 }
 269
 270 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
 271 {
 272         acpi_status status;
 273         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 274         union acpi_object *hkey = NULL;
 275         int i;
 276
 277         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
 278                                       &buffer);
 279         if (ACPI_FAILURE(status)) {
 280                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 281                                   "evaluation error HKEY.SINF\n"));
 282                 return 0;
 283         }
 284
 285         hkey = buffer.pointer;
 286         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
 287                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
 288                 goto end;
 289         }
 290
 291         if (pcc->num_sifr < hkey->package.count) {
 292                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 293                                  "SQTY reports bad SINF length\n"));
 294                 status = AE_ERROR;
 295                 goto end;
 296         }
 297
 298         for (i = 0; i < hkey->package.count; i++) {
 299                 union acpi_object *element = &(hkey->package.elements[i]);
 300                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
 301                         sinf[i] = element->integer.value;
 302                 } else
 303                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 304                                          "Invalid HKEY.SINF data\n"));
 305         }
 306         sinf[hkey->package.count] = -1;
 307
 308 end:
 309         kfree(buffer.pointer);
 310         return status == AE_OK;
 311 }
 312
 313 /* backlight API interface functions */
 314
 315 /* This driver currently treats AC and DC brightness identical,
 316  * since we don't need to invent an interface to the core ACPI
 317  * logic to receive events in case a power supply is plugged in
 318  * or removed */
 319
 320 static int bl_get(struct backlight_device *bd)
 321 {
 322         struct pcc_acpi *pcc = bl_get_data(bd);
 323
 324         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 325                 return -EIO;
 326
 327         return pcc->sinf[SINF_AC_CUR_BRIGHT];
 328 }
 329
 330 static int bl_set_status(struct backlight_device *bd)
 331 {
 332         struct pcc_acpi *pcc = bl_get_data(bd);
 333         int bright = bd->props.brightness;
 334         int rc;
 335
 336         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 337                 return -EIO;
 338
 339         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
 340                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
 341
 342         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
 343                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
 344
 345         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
 346             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
 347                 return -EINVAL;
 348
 349         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
 350         if (rc < 0)
 351                 return rc;
 352
 353         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
 354 }
 355
 356 static const struct backlight_ops pcc_backlight_ops = {
 357         .get_brightness = bl_get,
 358         .update_status  = bl_set_status,
 359 };
 360
 361
 362 /* sysfs user interface functions */
 363
 364 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
 365                             char *buf)
 366 {
 367         struct acpi_device *acpi = to_acpi_device(dev);
 368         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 369
 370         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 371                 return -EIO;
 372
 373         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
 374 }
 375
 376 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
 377                             char *buf)
 378 {
 379         struct acpi_device *acpi = to_acpi_device(dev);
 380         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 381
 382         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 383                 return -EIO;
 384
 385         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
 386 }
 387
 388 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
 389                          char *buf)
 390 {
 391         struct acpi_device *acpi = to_acpi_device(dev);
 392         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 393
 394         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 395                 return -EIO;
 396
 397         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
 398 }
 399
 400 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
 401                            char *buf)
 402 {
 403         struct acpi_device *acpi = to_acpi_device(dev);
 404         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 405
 406         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 407                 return -EIO;
 408
 409         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
 410 }
 411
 412 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
 413                           const char *buf, size_t count)
 414 {
 415         struct acpi_device *acpi = to_acpi_device(dev);
 416         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 417         int val;
 418
 419         if (count && sscanf(buf, "%i", &val) == 1 &&
 420             (val == 0 || val == 1)) {
 421                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
 422                 pcc->sticky_mode = val;
 423         }
 424
 425         return count;
 426 }
 427
 428 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
 429 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
 430 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
 431 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
 432
 433 static struct attribute *pcc_sysfs_entries[] = {
 434         &dev_attr_numbatt.attr,
 435         &dev_attr_lcdtype.attr,
 436         &dev_attr_mute.attr,
 437         &dev_attr_sticky_key.attr,
 438         NULL,
 439 };
 440
 441 static struct attribute_group pcc_attr_group = {
 442         .name   = NULL,         /* put in device directory */
 443         .attrs  = pcc_sysfs_entries,
 444 };
 445
 446
 447 /* hotkey input device driver */
 448
 449 static int pcc_getkeycode(struct input_dev *dev,
 450                           unsigned int scancode, unsigned int *keycode)
 451 {
 452         struct pcc_acpi *pcc = input_get_drvdata(dev);
 453
 454         if (scancode >= ARRAY_SIZE(pcc->keymap))
 455                 return -EINVAL;
 456
 457         *keycode = pcc->keymap[scancode];
 458
 459         return 0;
 460 }
 461
 462 static int keymap_get_by_keycode(struct pcc_acpi *pcc, unsigned int keycode)
 463 {
 464         int i;
 465
 466         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
 467                 if (pcc->keymap[i] == keycode)
 468                         return i+1;
 469         }
 470
 471         return 0;
 472 }
 473
 474 static int pcc_setkeycode(struct input_dev *dev,
 475                           unsigned int scancode, unsigned int keycode)
 476 {
 477         struct pcc_acpi *pcc = input_get_drvdata(dev);
 478         int oldkeycode;
 479
 480         if (scancode >= ARRAY_SIZE(pcc->keymap))
 481                 return -EINVAL;
 482
 483         oldkeycode = pcc->keymap[scancode];
 484         pcc->keymap[scancode] = keycode;
 485
 486         set_bit(keycode, dev->keybit);
 487
 488         if (!keymap_get_by_keycode(pcc, oldkeycode))
 489                 clear_bit(oldkeycode, dev->keybit);
 490
 491         return 0;
 492 }
 493
 494 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 495 {
 496         struct input_dev *hotk_input_dev = pcc->input_dev;
 497         int rc;
 498         int key_code, hkey_num;
 499         unsigned long long result;
 500
 501         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
 502                                    NULL, &result);
 503         if (!ACPI_SUCCESS(rc)) {
 504                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 505                                  "error getting hotkey status\n"));
 506                 return;
 507         }
 508
 509         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
 510
 511         hkey_num = result & 0xf;
 512
 513         if (hkey_num < 0 || hkey_num >= ARRAY_SIZE(pcc->keymap)) {
 514                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 515                                   "hotkey number out of range: %d\n",
 516                                   hkey_num));
 517                 return;
 518         }
 519
 520         key_code = pcc->keymap[hkey_num];
 521
 522         if (key_code != KEY_RESERVED) {
 523                 int pushed = (result & 0x80) ? TRUE : FALSE;
 524
 525                 input_report_key(hotk_input_dev, key_code, pushed);
 526                 input_sync(hotk_input_dev);
 527         }
 528
 529         return;
 530 }
 531
 532 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
 533 {
 534         struct pcc_acpi *pcc = acpi_driver_data(device);
 535
 536         switch (event) {
 537         case HKEY_NOTIFY:
 538                 acpi_pcc_generate_keyinput(pcc);
 539                 break;
 540         default:
 541                 /* nothing to do */
 542                 break;
 543         }
 544 }
 545
 546 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 547 {
 548         int i, rc;
 549
 550         pcc->input_dev = input_allocate_device();
 551         if (!pcc->input_dev) {
 552                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 553                                   "Couldn't allocate input device for hotkey"));
 554                 return -ENOMEM;
 555         }
 556
 557         pcc->input_dev->evbit[0] = BIT(EV_KEY);
 558
 559         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
 560         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
 561         pcc->input_dev->id.bustype = BUS_HOST;
 562         pcc->input_dev->id.vendor = 0x0001;
 563         pcc->input_dev->id.product = 0x0001;
 564         pcc->input_dev->id.version = 0x0100;
 565         pcc->input_dev->getkeycode = pcc_getkeycode;
 566         pcc->input_dev->setkeycode = pcc_setkeycode;
 567
 568         /* load initial keymap */
 569         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
 570
 571         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
 572                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
 573         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
 574
 575         input_set_drvdata(pcc->input_dev, pcc);
 576
 577         rc = input_register_device(pcc->input_dev);
 578         if (rc < 0)
 579                 input_free_device(pcc->input_dev);
 580
 581         return rc;
 582 }
 583
 584 /* kernel module interface */
 585
 586 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
 587 {
 588         struct pcc_acpi *pcc = acpi_driver_data(device);
 589         acpi_status status = AE_OK;
 590
 591         if (device == NULL || pcc == NULL)
 592                 return -EINVAL;
 593
 594         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
 595                           pcc->sticky_mode));
 596
 597         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
 598
 599         return status == AE_OK ? 0 : -EINVAL;
 600 }
 601
 602 static int acpi_pcc_hotkey_add(struct acpi_device *device)
 603 {
 604         struct backlight_properties props;
 605         struct pcc_acpi *pcc;
 606         int num_sifr, result;
 607
 608         if (!device)
 609                 return -EINVAL;
 610
 611         num_sifr = acpi_pcc_get_sqty(device);
 612
 613         if (num_sifr > 255) {
 614                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
 615                 return -ENODEV;
 616         }
 617
 618         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 619         if (!pcc) {
 620                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 621                                   "Couldn't allocate mem for pcc"));
 622                 return -ENOMEM;
 623         }
 624
 625         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
 626         if (!pcc->sinf) {
 627                 result = -ENOMEM;
 628                 goto out_hotkey;
 629         }
 630
 631         pcc->device = device;
 632         pcc->handle = device->handle;
 633         pcc->num_sifr = num_sifr;
 634         device->driver_data = pcc;
 635         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 636         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 637
 638         result = acpi_pcc_init_input(pcc);
 639         if (result) {
 640                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 641                                   "Error installing keyinput handler\n"));
 642                 goto out_hotkey;
 643         }
 644
 645         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
 646                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 647                                  "Couldn't retrieve BIOS data\n"));
 648                 goto out_input;
 649         }
 650         /* initialize backlight */
 651         memset(&props, 0, sizeof(struct backlight_properties));
 652         props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
 653         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 654                                                    &pcc_backlight_ops, &props);
 655         if (IS_ERR(pcc->backlight)) {
 656                 result = PTR_ERR(pcc->backlight);
 657                 goto out_sinf;
 658         }
 659
 660         /* read the initial brightness setting from the hardware */
 661         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 662
 663         /* read the initial sticky key mode from the hardware */
 664         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 665
 666         /* add sysfs attributes */
 667         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 668         if (result)
 669                 goto out_backlight;
 670
 671         return 0;
 672
 673 out_backlight:
 674         backlight_device_unregister(pcc->backlight);
 675 out_sinf:
 676         kfree(pcc->sinf);
 677 out_input:
 678         input_unregister_device(pcc->input_dev);
 679         /* no need to input_free_device() since core input API refcount and
 680          * free()s the device */
 681 out_hotkey:
 682         kfree(pcc);
 683
 684         return result;
 685 }
 686
 687 static int __init acpi_pcc_init(void)
 688 {
 689         int result = 0;
 690
 691         if (acpi_disabled)
 692                 return -ENODEV;
 693
 694         result = acpi_bus_register_driver(&acpi_pcc_driver);
 695         if (result < 0) {
 696                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 697                                   "Error registering hotkey driver\n"));
 698                 return -ENODEV;
 699         }
 700
 701         return 0;
 702 }
 703
 704 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 705 {
 706         struct pcc_acpi *pcc = acpi_driver_data(device);
 707
 708         if (!device || !pcc)
 709                 return -EINVAL;
 710
 711         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 712
 713         backlight_device_unregister(pcc->backlight);
 714
 715         input_unregister_device(pcc->input_dev);
 716         /* no need to input_free_device() since core input API refcount and
 717          * free()s the device */
 718
 719         kfree(pcc->sinf);
 720         kfree(pcc);
 721
 722         return 0;
 723 }
 724
 725 static void __exit acpi_pcc_exit(void)
 726 {
 727         acpi_bus_unregister_driver(&acpi_pcc_driver);
 728 }
 729
 730 module_init(acpi_pcc_init);
 731 module_exit(acpi_pcc_exit);